There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

Can you divide the below-given shape into four equal and identical pieces?

Move three sticks of the spiral below to form a square.

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

Can you find the hidden animal in the picture below?

Can you solve the photo plexer logic ?

What is the riddle which can be asked all day with a different correct answer each time.

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

What is both possible and impossible at the same time?